00:01Earth Climate
00:06Spanish breakthrough in measuring methane emissions
00:11could transform.
00:13Climate Predictions, University of Granada
00:17Researchers have deployed the first floating platform
00:21with eddy covariance technology in Spain
00:23to continuously monitor greenhouse gas emissions from a reservoir
00:27revealing critical climate vulnerabilities.
00:31Continental aquatic ecosystems occupy less than 2% of Earth's surface
00:36yet generate 40-50% of global methane emissions.
00:40However, uncertainty about their true greenhouse gas output has persisted
00:46because most data comes from one-off, point-in-time measurements
00:50that miss crucial patterns.
00:53That changed when an interdisciplinary team
00:55from the University of Granada
00:58installed a measurement tower on a floating platform in the Cubilis Reservoir.
01:03For the first time in Spain, the installation uses eddy covariance technology,
01:08a sophisticated micrometeorological technique,
01:11to continuously measure carbon dioxide and methane emissions from water surfaces.
01:17Key Findings with Alarming Implications
01:20Over two years spanning diverse hydrological conditions,
01:24researchers discovered that methane emissions spike dramatically during droughts
01:28when water levels drop.
01:31Lower water accelerates biogeochemical processes in sediments,
01:35intensifying methane production and bubbling.
01:37Carbon dioxide emissions remained stable, but methane fluctuated unpredictably,
01:43changing abruptly over hours or days in patterns that traditional sampling completely missed.
01:50Wind speed and eutrophication amplified these swings.
01:54The detected daily fluctuations and episodic emission events would be invisible with conventional methods,
02:00the research team noted.
02:03Climate Urgency
02:05Methane's global warming potential is 80 times stronger than carbon dioxide over 20 years,
02:12making even small emission increases significant.
02:16Mediterranean reservoirs face a compounding crisis.
02:19Climate projections show increasing droughts and intensifying eutrophication,
02:24both of which dramatically boost methane release.
02:27Published in Global Change Biology,
02:30the research warns that Mediterranean reservoirs could substantially amplify greenhouse gas contributions
02:37under future climate scenarios, reinforcing their role as accelerating climate threat,
02:43rather than climate-neutral infrastructure.
02:46With nearly 90% of Earth's rivers projected to have dams by mid-century,
02:52understanding and controlling reservoir emissions is now urgent for climate policy.
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